How to start Service using Alarmmanager in Kotlin Android?

This example demonstrates how to start Service using Alarmmanager in Kotlin Android.

Step 1 − Create a new project in Android Studio, go to File ⇉ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/activity_main"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:gravity="center_horizontal"
   android:orientation="vertical"
   android:padding="16sp">
   <TextView
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginTop="40dp"
      android:text="Tutorials Point"
      android:textAlignment="center"
      android:textColor="@android:color/holo_blue_light"
      android:textSize="32sp"
      android:textStyle="bold" />
   <Button
      android:id="@+id/btnStartService"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginTop="30dp"
      android:text="Start Service Alarm" />
   <Button
      android:id="@+id/btnStopService"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_marginTop="10dp"
      android:text="Cancel Service" />
</LinearLayout>

Step 3 − Add the following code to src/MainActivity.kt

import android.app.AlarmManager
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.widget.Button
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import java.util.*
class MainActivity : AppCompatActivity() {
   private lateinit var btnStart: Button
   private lateinit var btnStop: Button
   lateinit var pendingIntent: PendingIntent
   override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)
      setContentView(R.layout.activity_main)
      title = "KotlinApp"
      btnStart = findViewById(R.id.btnStartService)
      btnStop = findViewById(R.id.btnStopService)
      btnStart.setOnClickListener {
         val myIntent = Intent(this@MainActivity, MyAlarmService::class.java)
         pendingIntent = PendingIntent.getService(this@MainActivity, 0, myIntent, 0)
         val alarmManager: AlarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
         val calendar: Calendar = Calendar.getInstance()
         calendar.timeInMillis = System.currentTimeMillis()
         calendar.add(Calendar.SECOND, 3)
         alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.timeInMillis, pendingIntent)
         Toast.makeText(baseContext, "Starting Service Alarm", Toast.LENGTH_LONG).show()
      }
      btnStop.setOnClickListener {
         val alarmManager: AlarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
         alarmManager.cancel(pendingIntent)
         Toast.makeText(baseContext, "Service Cancelled", Toast.LENGTH_LONG).show()
      }
   }
}

Step 4 − Add the following code to src/MyAlarmService.kt

import android.app.Service
import android.content.Intent
import android.os.IBinder
import android.widget.Toast
@Suppress("DEPRECATION")
class MyAlarmService : Service() {
   override fun onCreate() {
      Toast.makeText(this, "MyAlarmService.onCreate()", Toast.LENGTH_LONG).show();
      super.onCreate()
   }
   override fun onBind(intent: Intent?): IBinder? {
      Toast.makeText(this, "MyAlarmService.onBind()", Toast.LENGTH_LONG).show();
      return null
   }
   override fun onDestroy() {
      super.onDestroy()
      Toast.makeText(this, "MyAlarmService.onDestroy()", Toast.LENGTH_LONG).show()
   }
   override fun onStart(intent: Intent?, startId: Int) {
      super.onStart(intent, startId)
      Toast.makeText(this, "MyAlarmService.onStart()", Toast.LENGTH_LONG).show()
   }
   override fun onUnbind(intent: Intent?): Boolean {
      Toast.makeText(this, "MyAlarmService.onUnbind()", Toast.LENGTH_LONG).show()
      return super.onUnbind(intent)
   }
}

Step 5 − Add the following code to androidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="app.com.kotlipapp">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      android:supportsRtl="true"
      android:theme="@style/AppTheme">
      <activity android:name=".MainActivity">
         <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
      </activity>
   </application>
</manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run   icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen −

Click here to download the project code.